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KMID : 0376219860230010199
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Chonnam Medical Journal
1986 Volume.23 No. 1 p.199 ~ p.207
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Reflex action of semicircular canals on the sternocephalicus and ocular oblique muscles in rabbits
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Abstract
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The individual semicircular canal nerve was electrically stimulated and then, the reflex responses of the sternocephalicus as well as the ocular oblique muscles were recorded in terms of electromyographic activities. The following results were obtained.
1) The sternocephalicus muscles revealed the decreased muscle activities in response to stimulation of ipsilateral anterior canal nerve and increased activities to stimulation of contralateral posterior canal nerve.
2) The superior oblique muscle showed the increased muscle activities during stimulation of ipsilateral anterior canal nerve and the decreased activities during stimulation of contralateral posterior canal nerve.
3) During simultaneous recording, the sternocephalicus and superior oblique muscles always revealed contrary reactions in response to the vertical (ipsilateral anterior and contralateral posterior) canal nerve stimulation.
4) The activity of sternocephalicus muscle was inhibited by stimulation of ipsilateral horizontal canal nerve and was excited by the contralateral horizontal canal.
5) During simultaneous recording, the sternocephalicus and inferior oblique muscles were similarly inhibited by stimulation of ipsilateral horizontal canal nerve and were excited by contralateral horizontal canal.
The above experimental results indicate that excitation of the each semicircular canal elicit contrary responses between the sternocephalicus and superior oblique muscles, and similar responses between the sternocephalicus and inferior oblique muscle. Considering the crossed enervation of the superior oblique muscle from the motor neuron located in the contralateral mesencephalon, however, it becomes evident that functional organization between the semicircular canals and the motor neuron of these muscles are all identical.
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